1866 Sisyphus (1972 XA)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5381207270 ± 5.42e-09
Semi-major axis (a)1.8933719410 AU ± 4.50e-10
Inclination (i)41.20633494° ± 7.87e-07
Long. of Asc. Node (Ω)63.44668864° ± 1.04e-06
Arg. of Perihelion (ω)293.09862767° ± 1.07e-06
Mean Anomaly (M)140.66424737° ± 8.67e-07
Mean Motion (n)0.3783191899°/day ± 1.35e-10
Perihelion dist (q)0.87450926 AU ± 1.03e-08
Aphelion dist (Q)2.91223463 AU ± 1.03e-08
Orbital Period2.60527700 yr ± 9.28e-10
Physical Parameters
H (abs. magnitude)12.48
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.220″
Uncertainty0
Orbit TypeApollo
MOID0.102869 AU
Observations Used9210
Radar Obs Used1
Gaia Obs Used79
Oppositions38
Arc Total1955-2026
First Observation Used1955-01-26
Last Observation Used2026-04-06
Observations (11960)
Date Type RA Dec Mag Band Observatory
2019-06-25 09:14:30 S 06 45 40.622 -78 07 35.65 V C57
2019-06-25 09:14:30 s 1 -23383.125 0 +402025.14 3090.0 C57
2019-06-25 09:44:30 S 06 45 43.274 -78 05 54.38 V C57
2019-06-25 09:44:30 s 1 -24408.186 0 +402229.43 5270.0 C57
2019-06-25 10:14:30 S 06 45 46.502 -78 04 04.19 V C57
2019-06-25 10:14:30 s 1 -25432.834 0 +402425.87 3050.0 C57
2019-06-25 10:44:30 S 06 45 49.162 -78 02 25.62 V C57
2019-06-25 10:44:30 s 1 -26457.048 0 +402614.47 6490.0 C57
2019-06-25 11:14:30 S 06 45 52.298 -78 00 28.51 V C57
2019-06-25 11:14:30 s 1 -27480.809 0 +402795.22 5690.0 C57
2019-06-25 11:44:30 S 06 45 55.147 -77 58 50.27 V C57
2019-06-25 11:44:30 s 1 -28504.098 0 +402968.16 730.0 C57
2019-06-25 12:14:30 S 06 45 58.027 -77 56 58.74 V C57
2019-06-25 12:14:30 s 1 -29526.897 0 +403133.27 1680.0 C57
2019-06-25 12:44:30 S 06 46 01.044 -77 55 07.79 V C57
2019-06-25 12:44:30 s 1 -30549.184 0 +403290.58 8620.0 C57
2019-06-25 13:14:30 S 06 46 03.713 -77 53 33.22 V C57
2019-06-25 13:14:30 s 1 -31570.942 0 +403440.08 1640.0 C57
2019-06-25 13:44:30 S 06 46 06.691 -77 51 35.06 V C57
2019-06-25 13:44:30 s 1 -32592.151 0 +403581.80 810.0 C57
2019-06-25 14:14:30 S 06 46 09.444 -77 49 55.13 V C57
2019-06-25 14:14:30 s 1 -33612.792 0 +403715.73 6210.0 C57
2019-06-25 14:44:30 S 06 46 12.482 -77 48 04.46 V C57
2019-06-25 14:44:30 s 1 -34632.845 0 +403841.89 7920.0 C57
2019-06-25 15:14:30 S 06 46 15.106 -77 46 14.95 V C57
2019-06-25 15:14:30 s 1 -35652.293 0 +403960.29 6020.0 C57
2019-06-25 15:44:30 S 06 46 17.748 -77 44 41.28 V C57
2019-06-25 15:44:30 s 1 -36671.116 0 +404070.93 580.0 C57
2019-06-25 16:14:30 S 06 46 20.842 -77 42 43.42 V C57
2019-06-25 16:14:30 s 1 -37689.294 0 +404173.81 1680.0 C57
2019-06-25 16:44:30 S 06 46 23.299 -77 41 02.62 V C57
2019-06-25 16:44:30 s 1 -38706.809 0 +404268.96 9400.0 C57
2019-06-25 17:44:30 S 06 46 29.088 -77 37 22.58 V C57
2019-06-25 17:44:30 s 1 -40739.776 0 +404436.06 5010.0 C57
2019-06-25 18:14:30 S 06 46 31.421 -77 35 46.72 V C57
2019-06-25 18:14:30 s 1 -41755.189 0 +404508.02 3050.0 C57
2019-06-25 18:44:30 S 06 46 34.459 -77 33 51.30 V C57
2019-06-25 18:44:30 s 1 -42769.864 0 +404572.28 8010.0 C57
2019-06-25 19:44:30 S 06 46 39.540 -77 30 23.54 V C57
2019-06-25 19:44:30 s 1 -44796.924 0 +404677.68 9010.0 C57
2019-06-25 20:14:30 S 06 46 42.480 -77 28 32.99 V C57
2019-06-25 20:14:30 s 1 -45809.271 0 +404718.84 5190.0 C57
2019-06-25 20:44:30 S 06 46 44.983 -77 26 50.28 V C57
2019-06-25 20:44:30 s 1 -46820.805 0 +404752.31 8610.0 C57
2019-06-25 21:14:30 S 06 46 47.719 -77 25 01.16 V C57
2019-06-25 21:14:30 s 1 -47831.507 0 +404778.11 9320.0 C57
2019-06-25 21:44:30 S 06 46 50.556 -77 23 12.55 V C57
2019-06-25 21:44:30 s 1 -48841.359 0 +404796.24 7410.0 C57
2019-06-25 22:14:30 S 06 46 53.066 -77 21 23.18 V C57
2019-06-25 22:14:30 s 1 -49850.341 0 +404806.70 2950.0 C57
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1985-12-08 00:00:00 -295248 20 Hz 2380 -1 -1
1985-12-08.000000 -29524800 2000 Hz 2380 251 251
Station codes
-1 Arecibo (305-m, 1963–2020)